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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286af4523fb9f467b66a3875d9768448626a7349a966a86d8a7c7f574c34021a' 
  AND token = 'feZ6OhCZ9Qz75jXDFtEfC1fsBjYfsG6vDZDZQQmN8eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}